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The most relevant resource for additional information regarding airspace R-2305 during preflight planning is the Charts Supplements U.S. This supplement provides comprehensive details about various airspace types, including Restricted Areas like R-2305. It contains essential information such as dimensions, operating hours, conditions for entry, and any restrictions that pilots need to be aware of, which are crucial for safe and compliant flight planning.

While the Aeronautical Information Manual does provide general guidance on airspace and operations, it may not have the specific details about a particular restricted area that the Charts Supplements U.S. offer. The Special Use Airspace section of charts is specifically designed to outline these areas visually, but it does not provide the in-depth operational details needed for comprehensive preflight planning. Flight Service Station resources can be helpful for obtaining real-time updates and information, but for static and detailed planned use of airspace like R-2305, the Charts Supplements U.S. is the primary source.